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Method for obtaining biodegradable polymers

a biodegradable polymer and polymer technology, applied in the field of biodegradable polymer obtaining methods, can solve the problems of compound limitations in food contact applications, compound extenders present a multitude of problems and drawbacks, and extenders have a multitude of drawbacks, so as to improve the effect of colour, improve the commercial value of the market, and remove the risk of toxicity and pollution

Active Publication Date: 2020-10-08
MINERA CATALANO ARAGONESA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for obtaining biodegradable polymers that have improved color and do not require the use of chain extenders. This method is also more efficient economically and environmentally friendly. The polymers obtained can be used in food contact applications due to their safer properties. Additionally, this method reduces the cost of commissioning the plant and its energy consumption during the production process.

Problems solved by technology

These processes suffer from the problem of the use of chain extender compounds in one or several stages.
These chain extenders present a multitude of problems and drawbacks as they are generally not environmentally friendly chemical compounds, therefore many precautions must be taken for their safe handling.
These compounds also have limitations in food contact applications because of their level of toxicity.
Isocyanates are highly toxic because of the high reactivity of the isocyanate group.
Contact with the skin can cause irritation and inhalation can give rise to respiratory problems and even allergy.

Method used

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  • Method for obtaining biodegradable polymers

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036]To the paste-mixer were added 62.5 kg PTA, 66.8 kg ADA, 96 kg BDO, 6 kg polyethertriamine and 1 kg sodium sulfoisophthalic acid (SSIPA). They were mixed for 1 hour and 93 kg / h of the mixture was continuously passed to the esterification reactor, which contained 100 kg of the previously prepared mother paste at 240° C. and 400 mbar. In the esterification reactor, a flow of catalyst was added at 72 g / hour of tetrabutyl titanate (TNBT) at the top and a flow of 115 g / h of triethyl phosphate (TEP) through the side.

[0037]The raw materials were input continuously and the product (monomer or oligomer) flowed out at 72 kg / h and water and other volatiles through the column head.

[0038]The product obtained is continuously input, at the same time as 24 g / h TNBT to a prepolycondensation reactor operating at 240° C. and 60 mbar, and a prepolymer is continuously obtained, which was input into the polycondensation reactor operating at 240° C. and 1-2 mbar It is maintained for a residence time ...

example 2

[0042]To the paste-mixer are added 65 kg PTA, 63 Kg ADA, 96 kg BDO, 3 kg polyethertriamine and 1.5 kg SSIPA. They are mixed for 1 hour and 93 kg / h of the mixture is continuously passed to the esterification reactor, which contained 100 kg of the previously prepared mother paste at 240° C. and 400 mbar. In the esterification reactor, a flow of 72 g / h of TNBT was added.

[0043]The raw materials are input continuously and the product (monomer or oligomer) flowed out at 70 kg / h and water and other volatiles through the column head.

[0044]The product obtained is continuously input, at the same time as 24 g / h TNBT to a prepolycondensation reactor operating at 240° C. and 60 mbar, and a prepolymer is continuously obtained, which is input into the polycondensation reactor operating at 240° C. and 1-2 mbar. It is maintained for a residence time of 2 hours and a polymer was obtained with the following properties:[0045]Intrinsic viscosity of 1.15 dl / g.[0046]Melt Volume Rate (MVR) (190° C. / 2.16 kg...

example 3

[0048]To the paste-mixer are added 68 kg PTA, 61.8 kg ADA, 96 kg BDO, 7.5 kg polyethertriamine and 1.5 kg SSIPA. They are mixed for 1 hour and 93 kg / h of the mixture is continuously passed to the esterification reactor, which contained 100 kg of the previously prepared mother paste at 240° C. and 400 mbar. In the esterification reactor, a flow of 82 g / h of TNBT is added.

[0049]The raw materials are continuously input and the product (monomer or oligomer) flowed out at 72 kg / h and water and other volatiles through the column head.

[0050]The product obtained is continuously input, at the same time as 33 g / h TNBT to a prepolycondensation reactor operating at 240° C. and 60 mbar, and a prepolymer is continuously obtained, which is input into the polycondensation reactor operating at 240° C. and 1-2 mbar. It is maintained for a residence time of 4.5 hours and a polymer is obtained with the following properties:[0051]Intrinsic viscosity 1.47 dl / g.[0052]Melt Volume Rate (MVR) (190° C. / 2.16 k...

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Abstract

Method for obtaining biodegradable polymers that has a stage of esterification and / or transesterification and amidation reaction, a stage of prepolycondensation, a stage of polycondensation, a stage of extraction and a stage of drying, eliminating the use of chain extenders. The polymer can achieve all the range of viscosities desired and with an improved colour compared to the polymer from other methods, where chain extenders are used, provide a more efficient process, that is environmentally cleaner and safer for the operatives.

Description

[0001]This descriptive specification refers, as the title indicates, to a method for obtaining biodegradable polymers that comprises a stage of esterification and / or transesterification and amidation reaction, a stage of prepolycondensation, a stage of polycondensation, a stage of extraction and a stage of drying, eliminating in this way the use of chain extenders, which are often used when these polymers are produced.FIELD OF THE INVENTION[0002]The invention is in the field of methods for obtaining biodegradable polymers based on aliphatic or aliphatic and aromatic dicarboxylic acids and aliphatic dihydroxy compounds such as biodegradable polyesteretheramide.BACKGROUND OF THE INVENTION[0003]There are many well-known methods for obtaining biodegradable polymers. These processes suffer from the problem of the use of chain extender compounds in one or several stages. These chain extenders present a multitude of problems and drawbacks as they are generally not environmentally friendly ...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/672C08G63/685C08G63/80C08G69/46
CPCC08G2230/00C08G63/685C08G63/183C08G69/46C08G63/80C08G63/672C08G69/40C08G63/90C08G63/78C08G63/6856C08G63/16C08G69/44C08G63/18
Inventor ALFONSO ALEGRE, MARIA JOSEZAGALAZ LASIERRA, PATRICIACABALLERO LOPEZ, MIGUEL ANGEL
Owner MINERA CATALANO ARAGONESA
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